Hardcore, electric folk and sludge metal and crabcore.

FORBES: You and Your Musical Rut

Finnish heavy metal has a global reputation, but more recently Finnish folk music has been snapping its heels on the international stage.

NPR: The Sounds of Finnish Musical Experiments

On "Stuck on the Treadmill, " for example, he plays a beefy riff in unison with Mr. Prodaniuk, a technique that found its way into early heavy metal, but which Mr. Thompson said is common in Celtic folk.

WSJ: Still Electric After All These Years | Richard Thompson | By Jim Fusilli